A:hamburger
B:cake
将川芎植株的一叶片置于恒温的密闭小室,调节小室CO2浓度,在适宜光照强度下测定叶片光合作用的强度(以CO2吸收速率表示),测定结果如图.下列相关叙述,正确的是( )
This is my family ____.
若13a2m-5bn+1与﹣3ab3﹣n的和为单项式,则m+n=____ .
—How many people were there at the meeting?
—_______.